Red to violet wool dye.



. tained.

niany, have invented new and useful Inibe removed by means of organic solvents.

MAX WEILER, 0F ELBERFELD, GERMANY,

ASSIGNOR FARBENFABRIKEN VORM.

FRIEJDB. BAYER & 60.420]? ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

BED T0 VIOLET WOOL DYE.

carers.

No Drawing.

To all whom it may concern: a

lie it known that 1, Max VVnILnn, doctor of philosophy, chen'nst, a citizen of the German Empire, residing at lllberfeld, Gerprovenients in New Dye, of which the following is a specification.

My invention relates to the manufacture and production o'fnew dyestuffs which are obtained by condensing oxynaphthaldehyde compounds, especially sulfoniccarboxylicand sulfo-carboxylic acids, polyoxynaphthaldehydes with salicylic acid and orthocresotinic acid and ox dizing the leuco compounds thus obtaine The new dyestuffs can be treated on the fiber with bichromate oi. potassium, solid shades being thus ob-v In order to illustrate the new process more fully the following example is given, the parts being by weight:

A mixture of 37.6 parts of 2-oxy-1-naph tlialdehyde-3.7-disulfonic acid (sodium salt), 31) parts of ortho-cres otinic acid and 418 parts of a 88 per cent. sulfuric acid is heated to 4-045" C. while stirring until the whole cresotinic acid has (entered into reaction. The mass of the reaction is poured into ice water and the ieuco-compound is filtered off. Hui-all quantities of ortho-cresotinic acid can To produce the coloring matter from this leuco compound the dried product is dissolved in 5 times its quantity of concentrated sulfuric acid and the solution is stirred at 4060 C. with the necessary quantity of N hl'O When the oxidation is finished, the melt is poured on ice and the dye is filtered ofl. It dyes wool red after-treated with chrome red-violet.

Specification of Letters'Patent.

Applicationfiled fieptcmber ii, 1909. Serial No. 516,726.

Patented rein. 1., rain.

The new dyes are darkpowders soluble in dllute caustic soda lye generally wlth a red color, dyeing wool from acid baths gen- 'hyde-3.8- or 4:.8-disulfonic acid, 2-oxy-lnaphthaldehyde-B-carboxylic-Gsultonie acid, Q-oxy-l-naphtha]dehyde -3- carb0xylic- 8 sul fonie acid, 2.7-ditixy-l-naphthaldehyde, etc. The condensation can also be carried out in another manner e. with a mixture of acetic acid and sulfuric acid, a n'iethyl-alcoholic sulfuric acid, etc.

The oxidation can be carried out with nitric acid, nitro compounds, etc.

The herein described dyestuffs obtainable from the herein defined naphthaldehyde derivatives and salicylic or ortho-cresotinic acid, which dyestuffs are dark powders soluble in dilute caustic soda lye generally with a rcd color, dyeing wool from acid baths generally from red to violet shades which can be chromed after dyeing substantially as described. i

In testimony whereof I have liereiuito set my hand in the presence of two subscribing witnesses.

MAX WEILER. "In 5.] Witnesses:

()rro Klimt WILL! KLEIN. 

